Mail of Hellfire
Decreases defense but increases attack. Exact changes to stats depends on Switch Skill Swap Scroll that is being used.
Lv. 1: Using Red Scroll: Defense down, attack up. Using Blue Scroll: Resistance down, element up.
Lv. 2: Further decreases defense and resistance, while further increasing attack and element.
Lv. 3: Greatly decreases defense and resistance, while greatly increasing attack and element.
Sinister Grudge Garb 
Sinister Grudge Gauntlets 
Sinister Grudge Tassets